| 摘要 |
PURPOSE: To make a reproduced sound and a speaker sound of a musical instrument and a voice closer to sound heard directly by ears by using an acoustic device and restore characteristics such as a characteristic of a kind of musical instruments and articulation and a characteristic of consonants and vowels of the voice up to a considerable level even when the sound volume is small. CONSTITUTION: An acoustic signal converted into a digital signal is processed by a high speed digital arithmetic processor in the acoustic equipment. The sound quality is approached to an expected sound quality practically enough by using analog double differentiation circuits D1, D2 or a quadratic high frequency pass filter, double integral circuits I1, I2, or a quadratic low pass filter, and an adder ADD. |
